package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;


@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;


    //上传
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        log.info(file.toString());
        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //UUID生成文件名 防止文件名称重复 导致覆盖
        String fileName = UUID.randomUUID().toString() + suffix;
        //创建一个目录对象
        File dir = new File(basePath);
        //判断当前目录是否存在
        if(!dir.exists()){
            dir.mkdirs();
        }
        try {
            //将临时文件转存到指定位置
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }

        return R.success(fileName);
    }

    //下载
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入流 通过输入流读取文件内容
            FileInputStream fis = new FileInputStream(new File(basePath + name));
            //输入流, 通过输出流将文件写回浏览器
            ServletOutputStream os = response.getOutputStream();
            //response.setContentType("image/jpeg");
            //将输入流中数据 拷贝到输出流中
            IOUtils.copy(fis,os);

            //关闭资源
            fis.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}
